CN113757402B - Gate valve with closing limiting device - Google Patents
Gate valve with closing limiting device Download PDFInfo
- Publication number
- CN113757402B CN113757402B CN202111061731.3A CN202111061731A CN113757402B CN 113757402 B CN113757402 B CN 113757402B CN 202111061731 A CN202111061731 A CN 202111061731A CN 113757402 B CN113757402 B CN 113757402B
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- valve
- cavity
- screw
- seat
- rod
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- 238000007789 sealing Methods 0.000 claims abstract description 70
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 38
- 239000000428 dust Substances 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 15
- 230000008713 feedback mechanism Effects 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 210000003813 thumb Anatomy 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000010720 hydraulic oil Substances 0.000 description 8
- 230000033001 locomotion Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 241000883990 Flabellum Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0254—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor being operated by particular means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/12—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with wedge-shaped arrangements of sealing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0008—Mechanical means
- F16K37/0016—Mechanical means having a graduated scale
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0066—Hydraulic or pneumatic means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
The invention discloses a gate valve with a closing limiting device, which comprises a valve body, a valve rod, a valve cover, a flashboard, a bracket, a bevel gear transmission case and a hand wheel, wherein the valve rod is arranged on the valve cover; the device also comprises a closing limiting device, the closing limiting device comprises a connecting screw, a moving disc, a first locking nut, a second locking nut and a limiting ring, an upper mounting opening is arranged at the top of the box body of the bevel gear transmission box, the limiting ring is in threaded connection with the upper mounting opening, the outer end of the upper mounting opening is connected with a travel pipe, and the lower end of the travel pipe is propped against the upper end surface of the limiting ring; the screw has been seted up to the upper end of valve rod, and the lower extreme threaded connection of connecting screw is in the screw, and the spacing collar cover locks in the screw head inner of connecting screw through first lock nut, and second lock nut threaded connection is on connecting screw and is inconsistent with first lock nut. According to the invention, the closing limiting device is additionally arranged, so that the flashboard just moves to the optimal sealing position matched with the wedge-shaped valve seat when the valve rod stops descending, and good sealing performance of the valve is ensured.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a gate valve with a closing limiting device.
Background
The gate valve (gate valve) is a shutter, the moving direction of the shutter is perpendicular to the fluid direction, and the gate valve can only be fully opened and fully closed, and cannot be regulated and throttled. The gate valve is sealed by contact between the valve seat and the gate plate, and typically the sealing surface will be clad with a metal material to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The gate plate has a rigid gate plate and an elastic gate plate, and the gate valve is divided into a rigid gate valve and an elastic gate valve according to the difference of the gate plates.
The conventional gate valve in the market generally comprises a valve body, a wedge-shaped valve seat, a valve rod and a gate plate, wherein when the valve rod drives the gate plate to descend so that the valve is closed, the gate plate and the wedge-shaped valve seat can achieve the best sealing effect at a specific matching position, however, the valve rod is manually operated to move, the stroke of the valve rod is difficult to control, if the gate plate does not descend to the specific position, a larger gap is formed between the gate plate and the wedge-shaped valve seat, and medium leakage is easy to generate during working; if the flashboard descends to exceed the specific position, the wedge-shaped valve seat is stressed to generate local deformation, so that a certain gap is generated between the flashboard and the wedge-shaped valve seat, and medium leakage is easy to generate during operation.
Disclosure of Invention
The invention aims to provide a gate valve with a closing limiting device.
In order to achieve the above purpose, the present invention provides the following technical solutions: the gate valve with the closing limiting device comprises a valve body, a valve rod, a valve cover, a gate plate, a bracket, a bevel gear transmission box and a hand wheel, wherein the valve cover is arranged at the upper end of the valve body, an upper hole is formed in the upper end of the valve cover, the valve rod penetrates through the upper hole and stretches into the valve body to be in linkage connection with the gate plate arranged in the valve body, and a wedge-shaped valve seat in sealing fit with the gate plate is arranged on the inner wall of the valve body; the bracket is arranged at the upper end of the valve cover, the bevel gear transmission box is arranged on the bracket, the input shaft of the bevel gear transmission box is connected with the hand wheel in a linkage way, and the output shaft of the bevel gear transmission box is connected with the valve rod in a linkage way; the device also comprises a closing limiting device, wherein the closing limiting device comprises a connecting screw, a moving disc, a first locking nut, a second locking nut and a limiting ring, the top of the box body of the bevel gear transmission box is provided with an upper mounting port which is coaxial with the valve rod, the limiting ring is in threaded connection with the upper mounting opening, the outer end of the upper mounting opening is also in threaded connection with a travel pipe, and the lower end of the travel pipe is propped against the upper end face of the limiting ring; the upper end of the valve rod is provided with a screw hole, the lower end of the connecting screw is in threaded connection with the screw hole, the movable disc is sleeved on the periphery of the connecting screw and is locked at the inner end of the screw head of the connecting screw through a first locking nut, and the second locking nut is in threaded connection with the connecting screw and is in contact with the first locking nut; when the valve rod drives the closing limiting device to downwards drive the moving disc to abut against the limiting ring, the flashboard just moves to an optimal sealing position matched with the wedge-shaped valve seat.
Through adopting above-mentioned technical scheme, install additional on the valve rod and close stop device, when the valve rod drove to close stop device and down travel the movable disk and support on the spacing ring, the flashboard just moves to the best sealing position with wedge seat complex, has avoided the problem because of manual operation unable accurate control valve rod stroke, has guaranteed the good sealing performance of valve. Meanwhile, the closing limiting device is simple in structure, convenient to assemble and disassemble and beneficial to early assembly production and later maintenance operation.
The invention further provides a hydraulic stroke detection device, which comprises a base, an outer seat, an inner seat, a detection rod, a display mechanism and a feedback mechanism, wherein the base is arranged at the upper end of a stroke pipe, an outer cavity, an inner cavity, an overflow cavity and a guide hole which are coaxial with a guide pipe and have diameters which are reduced in sequence are sequentially formed in the base from top to bottom, the inner seat is embedded in the inner cavity, the outer seat is in threaded connection with the outer cavity and is in contact with the inner seat, a plurality of first thumb grooves are formed in the upper end of the outer seat, the detection rod is arranged in the guide hole in a sliding mode, and the lower end of the detection rod extends into the stroke pipe; the display mechanism comprises a rotating shaft, a movable fan blade, a fixed baffle, a linkage rod and a pointer, wherein a round groove is formed in one end, close to the outer seat, of the inner seat, the rotating shaft is rotatably arranged in the middle of the round groove, one side of the fixed baffle is welded on the inner wall of the round groove, the other side of the fixed baffle is tightly attached to the side part of the rotating shaft, the movable fan blade and the rotating shaft are of an integrated structure, one edge, far away from the rotating shaft, of the movable fan blade is tightly attached to the inner wall of the round groove, the movable fan blade and the fixed baffle divide the round groove into a first cavity and a second cavity, the first cavity is connected with the overflow cavity through a first flow channel, the linkage rod is connected with the rotating shaft in a linkage manner, and extends to the outside through the outer seat and is connected with the pointer in a linkage manner; the feedback mechanism comprises an adjusting cover, an adjusting spring and a piston block, wherein a piston cavity is formed in the outer seat, an annular flow passage communicated with the piston cavity is formed in one end, close to the inner seat, of the outer seat, a second flow passage communicated with the second cavity and the annular flow passage is formed in the inner seat, the adjusting cover is in threaded connection with the outer end of the piston cavity, the piston block is slidably arranged in the piston cavity, a piston sealing ring used for forming sealing fit with the inner wall of the piston cavity is arranged on the periphery of the piston block, a first cylindrical bulge is arranged on the piston block, a second cylindrical bulge is arranged on the adjusting cover, the adjusting spring is clamped between the piston block and the adjusting cover, and two ends of the adjusting spring are respectively sleeved on the first cylindrical bulge and the second cylindrical bulge; the inner seat is provided with a first sealing ring which is used for forming sealing fit with the inner end of the inner cavity, the position, corresponding to the inner ring and the outer ring of the annular flow channel, of the inner seat is provided with a second sealing ring and a third sealing ring which are used for forming sealing fit with the outer seat respectively, the detection rod is provided with a fourth sealing ring which is used for forming sealing fit with the inner wall of the guide hole, the movable fan blade is vertically provided with a first sealing strip which is used for forming sealing fit with the inner wall of the circular groove, and the fixed baffle is vertically provided with a second sealing strip which is used for forming sealing fit with the periphery of the rotating shaft; when the flashboard moves upwards and abuts against the inner end of the valve cover, the screw head of the connecting screw is just attached to the lower end of the detecting rod.
Through adopting above-mentioned technical scheme, because the valve is long-term open and shut practical, how much can lead to the cooperation of screw on connecting screw and the valve rod to produce not hard up to under natural suspension state, it is not hard up can lead to connecting screw and valve rod to produce the displacement that the trace was kept away from each other, thereby makes the flashboard not closely enough with wedge disk seat's cooperation. And whether the cooperation of screw and valve rod upper screw produces not hard up can be monitored in real time through hydraulic stroke detection device, during initial state, when the flashboard goes upward and offsets with the valve gap inner, the screw head of connecting screw just laminates with the lower extreme of measuring rod mutually, and when the cooperation of screw and valve rod upper screw produced not hard up, if the flashboard goes upward and offsets with the valve gap inner, the screw head of connecting screw withstands the measuring rod and makes its going up, and inside medium adopts hydraulic oil, and the measuring rod promotes the hydraulic oil motion when going up for hydraulic oil in the first cavity promotes the movable flabellum and rotates, and the second cavity diminish, and hydraulic oil in the second cavity is arranged in the piston chamber and is promoted the movable block to go up and compress adjusting spring, prepares for the action of resetting, and the another side is because the movable flabellum rotates, and the pivot also rotates along with it, and the gangbar drives the pointer and rotates, thereby reminds the staff to connect screw and the cooperation of valve rod upper screw to produce not hard up, needs to maintain.
The hydraulic stroke detection device further comprises a guide pipe, wherein an installation cavity is arranged between the guide hole and the overflow cavity, the diameter of the installation cavity is smaller than that of the overflow cavity and larger than that of the guide hole, the guide pipe penetrates through the overflow cavity and the installation cavity, two ends of the guide pipe respectively support against the lower end of the inner seat and the lower end face of the installation cavity, the middle part of the lower end of the inner seat is further connected with a set screw in a threaded manner, the upper end of the guide pipe is sleeved on the periphery of the screw head of the set screw, a plurality of through holes communicated with the overflow cavity are formed in the guide pipe, and the upper part of the detection rod is arranged in the guide pipe in a sliding manner.
By adopting the technical scheme, the axial movement of the detection rod can be more stable.
The invention is further characterized in that a plurality of guide convex parts are arranged at the upper part of the detection rod, a plurality of guide concave parts which extend along the axial direction and are matched with the guide convex parts are arranged on the inner wall of the guide pipe, a limit screw is connected with the lower end of the detection rod in a threaded manner, and the outer diameter of the screw head of the limit screw is larger than the diameter of the detection rod.
Through adopting above-mentioned technical scheme, not only can promote the stability of measuring staff axial displacement, can realize its upper limit stroke spacing and lower limit stroke spacing moreover, and simple structure, the dismouting is very convenient.
The invention is further characterized in that a rotating hole is formed in the middle of the circular groove, the lower end of the rotating shaft is rotatably arranged in the rotating hole, a fifth sealing ring which is used for being in sealing fit with the inner wall of the rotating hole is arranged on the rotating shaft, a polygonal linkage part is arranged at the upper end of the rotating shaft, a rotary disc is arranged at the lower end of the linkage rod, a polygonal linkage hole which is matched with the polygonal linkage part is formed in the rotary disc, a shaft sleeve is further arranged above the movable fan blade and the fixed baffle, the rotary disc is embedded in the shaft sleeve, and a sixth sealing ring which is used for being in sealing fit with the shaft sleeve is arranged on the rotary disc.
Through adopting above-mentioned technical scheme, can realize the linkage of pivot and gangbar, and have that connection stability is good and the cooperation friction is little advantage.
The invention is further arranged that the upper end of the linkage rod is sequentially provided with a central shaft and a threaded part, a positioning step is formed in front of the central shaft and the linkage rod, one end of the pointer is provided with a central hole for the central shaft to penetrate, the threaded part is in threaded connection with a mounting nut for limiting one end of the pointer on the positioning step, and the outer end of the outer seat is also provided with a bearing matched with the pointer.
Through adopting above-mentioned technical scheme, can realize the quick installation of gangbar and pointer, and have the advantage that frictional force is little.
The invention is further characterized in that the middle part of the piston block is provided with an exhaust channel along the circumferential direction, the upper end of the exhaust channel is connected with a plug in a threaded manner, and a sealing gasket is clamped between the plug and the piston block.
Through adopting above-mentioned technical scheme, can be when filling fluid in each runner inner chamber with inside gaseous discharge, finally install the end cap to avoid gaseous compressibility to cause the influence to the detection accuracy.
The invention is further characterized in that the regulating cover is provided with a pressure stabilizing channel which is used for communicating the piston cavity with the outside along the axial direction.
By adopting the technical scheme, the influence of the air pressure change above the piston block in the piston cavity on the movement of the piston block can be avoided.
The hydraulic stroke detection device further comprises a transparent dust cover, the transparent dust cover is arranged above the base, a sleeving flange extending along the circumferential direction is arranged at the lower end of the transparent dust cover, an annular sleeving groove matched with the sleeving flange is formed in the base, an annular locking groove is formed in the annular sleeving groove, an annular locking rib matched with the annular locking groove is arranged on the sleeving groove, a standard line is arranged on the inner side of the transparent dust cover, the pointer is aligned with the standard line in an initial state, air holes are further formed in the side portion of the transparent dust cover, and the air holes are obliquely arranged from inside to outside.
Through adopting above-mentioned technical scheme, can play the effect of protection pointer, the staff of also being convenient for observes the pointer simultaneously.
The invention is further characterized in that a first connecting flange is arranged on the periphery of the travel tube, a second connecting flange is arranged on the base, the first connecting flange and the second connecting flange are connected through a plurality of connecting bolts, a supporting spring is sleeved outside each connecting bolt Zhou Jun, the supporting spring is arranged between the first connecting flange and the second connecting flange, an upper spring groove for embedding the upper end of the supporting spring is formed in the first connecting flange, and a lower spring groove for embedding the lower end of the supporting spring is formed in the second connecting flange.
Through adopting above-mentioned technical scheme, not only can realize the firm connection of base and stroke pipe, the steadiness is strong moreover.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a closing limiting device according to the present invention;
FIG. 3 is a schematic view of the hydraulic stroke detecting device according to the present invention;
FIG. 4 is a schematic diagram of the cooperation structure of the rotating shaft, the movable fan blades and the fixed baffle plate of the present invention;
FIG. 5 is a schematic view of a part of the feedback mechanism of the present invention;
FIG. 6 is a schematic diagram of the mating structure of the catheter and the test stick of the present invention;
FIG. 7 is a schematic diagram of the cooperation structure of the rotating shaft and the linkage rod according to the present invention;
fig. 8 is a schematic diagram of a cooperation structure of the linkage rod and the pointer according to the present invention.
In the figure: 1. a valve body; 2. a valve stem; 3. a valve cover; 4. a flashboard; 5. a bracket; 6. a bevel gear box; 7. a hand wheel; 8. an upper hole; 9. a wedge-shaped valve seat; 10. closing the limiting device; 11. a connecting screw; 12. a moving tray; 13. a first lock nut; 14. a second lock nut; 15. a limiting ring; 16. a case; 17. an upper mounting port; 18. a travel tube; 19. a screw hole; 20. a hydraulic stroke detection device; 21. a base; 22. an inner seat; 23. an outer seat; 24. a detection rod; 25. a display mechanism; 26. a feedback mechanism; 27. an outer cavity; 28. an inner cavity; 29. a flow-through cavity; 30. a guide hole; 31. a first thumb well; 32. a rotating shaft; 33. moving the fan blade; 34. a fixed baffle; 35. a linkage rod; 36. a pointer; 37. a circular groove; 38. a first chamber; 39. a second chamber; 40. a first flow passage; 41. an adjustment cover; 42. an adjusting spring; 43. a piston block; 44. a piston chamber; 45. an annular flow passage; 46. a second flow passage; 47. a piston seal ring; 48. a first stud bump; 49. a second cylindrical protrusion; 50. a first seal ring; 51. a second seal ring; 52. a third seal ring; 53. a fourth seal ring; 54. a first sealing strip; 55. a second sealing strip; 56. a conduit; 57. a mounting cavity; 58. a set screw; 59. a via hole; 60. a guide protrusion; 61. a guide recess; 62. a limit screw; 63. a turning hole; 64. a fifth seal ring; 66. a polygonal linkage part; 67. a turntable; 68. a polygonal linkage hole; 69. a shaft sleeve; 70. a sixth seal ring; 71. a central shaft; 72. a threaded portion; 73. positioning the step; 74. a central bore; 75. installing a screw cap; 76. a bearing; 77. an exhaust passage; 78. a plug; 79. a sealing gasket; 80. a regulated pressure channel; 81. a transparent dust cover; 82. sleeving the flange; 83. an annular sleeve groove; 84. an annular locking groove; 85. annular locking ribs; 86. a standard line; 87. ventilation holes; 88. a first connection flange; 89. a second connection flange; 90. a connecting bolt; 91. a support spring; 92. a spring groove is formed; 93. and a lower spring groove.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples: the gate valve with the closing limiting device comprises a valve body 1, a valve rod 2, a valve cover 3, a gate plate 4, a bracket 5, a bevel gear box 6 and a hand wheel 7, wherein the valve cover 3 is arranged at the upper end of the valve body 1, an upper hole 8 is formed in the upper end of the valve cover 3, the valve rod 2 penetrates through the upper hole 8 and stretches into the valve body 1 to be in linkage connection with the gate plate 4 arranged in the valve body 1, and a wedge-shaped valve seat 9 which is in sealing fit with the gate plate 4 is arranged on the inner wall of the valve body 1; the bracket 5 is arranged at the upper end of the valve cover 3, the bevel gear transmission box 6 is arranged on the bracket 5, the input shaft of the bevel gear transmission box 6 is in linkage connection with the hand wheel 7, and the output shaft of the bevel gear transmission box 6 is in linkage connection with the valve rod 2; the automatic closing and limiting device comprises a closing and limiting device 10, wherein the closing and limiting device 10 comprises a connecting screw 11, a moving disc 12, a first locking nut 13, a second locking nut 14 and a limiting ring 15, an upper mounting opening 17 coaxial with the valve rod 2 is formed in the top of a box body 16 of the bevel gear transmission box 6, the limiting ring 15 is in threaded connection with the upper mounting opening 17, the outer end of the upper mounting opening 17 is also in threaded connection with a travel tube 18, and the lower end of the travel tube 18 abuts against the upper end face of the limiting ring 15; the upper end of the valve rod 2 is provided with a screw hole 19, the lower end of the connecting screw 11 is in threaded connection with the screw hole 19, the movable disc 12 is sleeved on the periphery of the connecting screw 11 and is locked at the inner end of the screw head of the connecting screw 11 through a first locking nut 13, and the second locking nut 14 is in threaded connection with the connecting screw 11 and is in contact with the first locking nut 13; when the valve rod 2 drives the closing limiting device 10 to downwards move the moving disc 12 to prop against the limiting ring 15, the flashboard 4 just moves to an optimal sealing position matched with the wedge-shaped valve seat 9, the problem that the stroke of the valve rod 2 cannot be accurately controlled due to manual operation is avoided, and good sealing performance of the valve is ensured. Meanwhile, the closing limiting device 10 is simple in structure, quite convenient to assemble and disassemble, and beneficial to early assembly production and later maintenance operation.
As shown in fig. 2 to 8, the hydraulic stroke detection device 20 further comprises a base 21, an outer seat 23, an inner seat 22, a detection rod 24, a display mechanism 25 and a feedback mechanism 26, wherein the base 21 is installed at the upper end of the stroke tube 18, the base 21 is sequentially provided with an outer cavity 27, an inner cavity 28, an overflow cavity 29 and a guide hole 30 which are coaxial with a guide pipe 56 and have sequentially reduced diameters from top to bottom, the inner seat 22 is embedded in the inner cavity 28, the outer seat 23 is in threaded connection with the outer cavity 27 and the outer seat 23 is in contact with the inner seat 22, the upper end of the outer seat 23 is provided with a plurality of first thumb grooves 31, the detection rod 24 is slidably arranged in the guide hole 30, and the lower end of the detection rod 24 extends into the stroke tube 18; the display mechanism 25 comprises a rotating shaft 32, a moving fan blade 33, a fixed baffle 34, a linkage rod 35 and a pointer 36, wherein a circular groove 37 is formed in one end, close to the outer seat 23, of the inner seat 22, the rotating shaft 32 is rotatably arranged in the middle of the circular groove 37, one side of the fixed baffle 34 is welded on the inner wall of the circular groove 37, the other side of the fixed baffle 34 is tightly attached to the side part of the rotating shaft 32, the moving fan blade 33 and the rotating shaft 32 are of an integrated structure, one edge, far away from the rotating shaft 32, of the moving fan blade 33 is tightly attached to the inner wall of the circular groove 37, the moving fan blade 33 and the fixed baffle 34 divide the circular groove 37 into a first cavity 38 and a second cavity 39, the first cavity 38 is connected with the overcurrent cavity 29 through a first flow channel 40, the linkage rod 35 penetrates through the outer seat 23 to the outside and is connected with the pointer 36 in a linkage manner; the feedback mechanism 26 comprises an adjusting cover 41, an adjusting spring 42 and a piston block 43, wherein a piston cavity 44 is formed in the outer seat 23, an annular flow passage 45 communicated with the piston cavity 44 is formed in one end, close to the inner seat 22, of the outer seat 23, a second flow passage 46 used for communicating the second cavity 39 with the annular flow passage 45 is formed in the inner seat 22, the adjusting cover 41 is in threaded connection with the outer end of the piston cavity 44, the piston block 43 is slidably arranged in the piston cavity 44, a piston sealing ring 47 used for being in sealing fit with the inner wall of the piston cavity 44 is arranged on the periphery of the piston block 43, a first cylindrical bulge 48 is arranged on the piston block 43, a second cylindrical bulge 49 is arranged on the adjusting cover 41, the adjusting spring 42 is clamped between the piston block 43 and the adjusting cover 41, and two ends of the adjusting spring 42 are sleeved on the first cylindrical bulge 48 and the second cylindrical bulge 49 respectively; the inner seat 22 is provided with a first sealing ring 50 for forming sealing fit with the inner end of the inner cavity 28, the inner seat 22 is provided with a second sealing ring 51 and a third sealing ring 52 for forming sealing fit with the outer seat 23 at positions corresponding to the inner ring and the outer ring of the annular flow channel 45, the detection rod 24 is provided with a fourth sealing ring 53 for forming sealing fit with the inner wall of the guide hole 30, the movable fan blade 33 is vertically provided with a first sealing strip 54 for forming sealing fit with the inner wall of the circular groove 37, and the fixed baffle 34 is vertically provided with a second sealing strip 55 for forming sealing fit with the periphery of the rotating shaft 32; when the flashboard 4 moves upwards and abuts against the inner end of the valve cover 3, the screw head of the connecting screw 11 is just attached to the lower end of the detecting rod 24. Because the valve is practically opened and closed for a long time, the connection screw 11 and the screw hole 19 on the valve rod 2 are loosened, and in a natural suspension state, the connection screw 11 and the valve rod 2 are slightly displaced away from each other due to the loosening, so that the flashboard 4 and the wedge-shaped valve seat 9 are not tightly matched. And whether the cooperation of the connecting screw 11 and the screw hole 19 on the valve rod 2 is loosened can be monitored in real time through the hydraulic stroke detection device 20, when the flashboard 4 moves upwards and abuts against the inner end of the valve cover 3 in an initial state, the screw head of the connecting screw 11 is just abutted against the lower end of the detection rod 24, when the cooperation of the connecting screw 11 and the screw hole 19 on the valve rod 2 is loosened, if the flashboard 4 moves upwards and abuts against the inner end of the valve cover 3, the screw head of the connecting screw 11 abuts against the detection rod 24 and enables the same to move upwards, hydraulic oil is adopted as an internal medium, the hydraulic oil is pushed to move when the detection rod 24 moves upwards, the hydraulic oil in the first chamber 38 pushes the movable fan blade 33 to rotate, the second chamber 39 becomes smaller, the hydraulic oil in the second chamber 39 is discharged into the piston chamber 44 to enable the movable fan blade 43 to move upwards and compress the adjusting spring 42, the other side is prepared for resetting action, and the rotating shaft 32 rotates along with the movement of the movable fan blade 33 to drive the screw hole 35, the linkage rod 35 drives the pointer 36 to rotate, so that workers are reminded that the cooperation of the connecting screw 11 and the screw rod 2 and the screw 19 is loosened, and maintenance is needed.
As shown in fig. 3 and 6, the hydraulic stroke detecting device 20 further includes a guide pipe 56, an installation cavity 57 is disposed between the guide hole 30 and the overflow cavity 29, the diameter of the installation cavity 57 is smaller than that of the overflow cavity 29 and larger than that of the guide hole 30, the guide pipe 56 passes through the overflow cavity 29 and the installation cavity 57, two ends of the guide pipe 56 respectively abut against the lower end of the inner seat 22 and the lower end face of the installation cavity 57, a set screw 58 is further screwed in the middle of the lower end of the inner seat 22, the upper end of the guide pipe 56 is sleeved on the periphery of the screw head of the set screw 58, a plurality of through holes 59 communicated with the overflow cavity 29 are formed in the guide pipe 56, and the upper portion of the detecting rod 24 is slidably disposed in the guide pipe 56.
As shown in fig. 6, the upper portion of the detecting rod 24 is provided with a plurality of guiding convex portions 60, the inner wall of the guide tube 56 is provided with a plurality of guiding concave portions 61 extending along the axial direction and adapted to the guiding convex portions 60, the lower end of the detecting rod 24 is connected with a limit screw 62 in a threaded manner, and the outer diameter of the screw head of the limit screw 62 is larger than the diameter of the detecting rod 24. The axial displacement stability of the detection rod 24 can be improved, the upper limit stroke limit and the lower limit stroke limit of the detection rod can be realized, and the axial displacement detection device is simple in structure and quite convenient to assemble and disassemble.
As shown in fig. 7, the middle part of the circular groove 37 is provided with a rotating hole 63, the lower end of the rotating shaft 32 is rotatably arranged in the rotating hole 63, the rotating shaft 32 is provided with a fifth sealing ring 64 which is used for forming sealing fit with the inner wall of the rotating hole 63, the upper end of the rotating shaft 32 is provided with a polygonal linkage part 66, the lower end of the linkage rod 35 is provided with a rotary table 67, the rotary table 67 is provided with a polygonal linkage hole 68 which is matched with the polygonal linkage part 66, a shaft sleeve 69 is further arranged above the movable fan blade 33 and the fixed baffle 34, the rotary table 67 is embedded in the shaft sleeve 69, and the rotary table 67 is provided with a sixth sealing ring 70 which is used for forming sealing fit with the shaft sleeve 69. The design can realize the linkage of the rotating shaft 32 and the linkage rod 35, and has the advantages of good connection stability and small matching friction.
As shown in fig. 8, the upper end of the linkage rod 35 is sequentially provided with a central shaft 71 and a threaded portion 72, a positioning step 73 is formed before the central shaft 71 and the linkage rod 35, a central hole 74 for the central shaft 71 to penetrate is formed at one end of the pointer 36, a mounting nut 75 for limiting one end of the pointer 36 on the positioning step 73 is connected to the threaded portion 72 in a threaded manner, and a bearing 76 matched with the pointer 36 is further mounted at the outer end of the outer seat 23. The design can realize quick installation of the linkage rod 35 and the pointer 36, and has the advantage of small friction force.
As shown in fig. 6, the middle part of the piston block 43 is provided with a vent channel 77 along the circumferential direction, the upper end of the vent channel 77 is connected with a plug 78 in a threaded manner, and a sealing gasket 79 is sandwiched between the plug 78 and the piston block 43. This design allows for the evacuation of the gas from the interior of each flow passage chamber 28 as it is filled with oil, and eventually the plugs 78, thereby avoiding the impact of gas compressibility on the accuracy of detection.
As shown in fig. 6, the regulating cover 41 is provided with a pressure stabilizing channel 80 for communicating the piston cavity 44 with the outside in the axial direction. This design can avoid that the change in air pressure in the piston chamber 44 above the piston block 43 affects the movement of the piston block 43.
As shown in fig. 3, the hydraulic stroke detection device 20 further includes a transparent dust cover 81, the transparent dust cover 81 is disposed above the base 21, a sleeve joint flange 82 extending along a circumferential direction is disposed at a lower end of the transparent dust cover 81, an annular sleeve joint groove 83 matching with the sleeve joint flange 82 is disposed on the base 21, an annular locking groove 84 is disposed on the annular sleeve joint groove 83, an annular locking rib 85 matching with the annular locking groove 84 is disposed on the sleeve joint flange 82, a standard line 86 is disposed on an inner side of the transparent dust cover 81, the pointer 36 is aligned with the standard line 86 in an initial state, an air hole 87 is further disposed on a side portion of the transparent dust cover 81, and the air hole 87 is disposed in a downward inclination from inside to outside. The design can protect the pointer 36 and is convenient for the staff to observe the pointer 36.
As shown in fig. 3, the outer circumference of the travel tube 18 is provided with a first connecting flange 88, the base 21 is provided with a second connecting flange 89, the first connecting flange 88 and the second connecting flange 89 are connected by a plurality of connecting bolts 90, a supporting spring 91 is sleeved on the outer Zhou Jun of each connecting bolt 90, the supporting spring 91 is arranged between the first connecting flange 88 and the second connecting flange 89, the first connecting flange 88 is provided with an upper spring groove 92 for embedding the upper end of the supporting spring 91, and the second connecting flange 89 is provided with a lower spring groove 93 for embedding the lower end of the supporting spring 91. The design not only can realize firm connection between the base 21 and the stroke tube 18, but also has strong stability.
Claims (9)
1. The utility model provides a gate valve with close stop device, includes valve body (1), valve rod (2), valve gap (3), flashboard (4), support (5), bevel gear case (6) and hand wheel (7), valve gap (3) are installed in valve body (1) upper end, and upper hole (8) have been seted up to valve gap (3) upper end, valve rod (2) run through upper hole (8) and stretch into inside valve body (1) and be connected with flashboard (4) linkage that sets up inside valve body (1), be equipped with on valve body (1) inner wall and constitute sealing fit's wedge disk seat (9) with flashboard (4); the support (5) is arranged at the upper end of the valve cover (3), the bevel gear transmission box (6) is arranged on the support (5), an input shaft of the bevel gear transmission box (6) is connected with the hand wheel (7) in a linkage manner, and an output shaft of the bevel gear transmission box (6) is connected with the valve rod (2) in a linkage manner; the method is characterized in that: the automatic closing device is characterized by further comprising a closing limiting device (10), wherein the closing limiting device (10) comprises a connecting screw (11), a moving disc (12), a first locking nut (13), a second locking nut (14) and a limiting ring (15), an upper mounting opening (17) coaxial with the valve rod (2) is formed in the top of a box body (16) of the bevel gear transmission box (6), the limiting ring (15) is in threaded connection with the upper mounting opening (17), the outer end of the upper mounting opening (17) is also in threaded connection with a travel tube (18), and the lower end of the travel tube (18) is propped against the upper end face of the limiting ring (15); the upper end of the valve rod (2) is provided with a screw hole (19), the lower end of the connecting screw (11) is in threaded connection with the screw hole (19), the movable disc (12) is sleeved on the periphery of the connecting screw (11) and is locked at the inner end of the screw head of the connecting screw (11) through a first locking nut (13), and the second locking nut (14) is in threaded connection with the connecting screw (11) and is in contact with the first locking nut (13); when the valve rod (2) drives the closing limiting device (10) to downwards move the moving disc (12) to prop against the limiting ring (15), the flashboard (4) just moves to an optimal sealing position matched with the wedge-shaped valve seat (9); the hydraulic stroke detection device (20) comprises a base (21), an outer seat (23), an inner seat (22), a detection rod (24), a display mechanism (25) and a feedback mechanism (26), wherein the base (21) is installed at the upper end of the stroke tube (18), an outer cavity (27), an inner cavity (28), an overflow cavity (29) and a guide hole (30) which are coaxial with a guide pipe (56) and sequentially reduced in diameter are sequentially formed in the base (21) from top to bottom, the inner seat (22) is embedded in the inner cavity (28), the outer seat (23) is in threaded connection with the outer cavity (27) and is in contact with the inner seat (22), a plurality of first thumb grooves (31) are formed in the upper end of the outer seat (23), the detection rod (24) is slidably arranged in the guide hole (30), and the lower end of the detection rod (24) extends into the stroke tube (18); the display mechanism (25) comprises a rotating shaft (32), a movable fan blade (33), a fixed baffle (34), a linkage rod (35) and a pointer (36), wherein a round groove (37) is formed in one end, close to an outer seat (23), of the inner seat (22), the rotating shaft (32) is rotatably arranged in the middle of the round groove (37), one side of the fixed baffle (34) is welded on the inner wall of the round groove (37), the other side of the fixed baffle (34) is tightly attached to the side part of the rotating shaft (32), the movable fan blade (33) is of an integral structure with the rotating shaft (32), one edge, far away from the rotating shaft (32), of the movable fan blade (33) is tightly attached to the inner wall of the round groove (37), the movable fan blade (33) and the fixed baffle (34) divide the round groove (37) into a first chamber (38) and a second chamber (39), the first chamber (38) is connected with the overcurrent cavity (29) through a first runner (40), the linkage rod (35) is connected with the rotating shaft (32), and the linkage rod (35) penetrates through the outer seat (23) and extends to the outside and is connected with the pointer (36); the feedback mechanism (26) comprises an adjusting cover (41), an adjusting spring (42) and a piston block (43), wherein a piston cavity (44) is formed in the outer seat (23), one end, close to the inner seat (22), of the outer seat (23) is provided with an annular flow passage (45) communicated with the piston cavity (44), the inner seat (22) is provided with a second flow passage (46) used for communicating a second cavity (39) with the annular flow passage (45), the adjusting cover (41) is in threaded connection with the outer end of the piston cavity (44), the piston block (43) is slidably arranged in the piston cavity (44), a piston sealing ring (47) used for forming sealing fit with the inner wall of the piston cavity (44) is arranged on the periphery of the piston block (43), a first cylindrical bulge (48) is arranged on the piston block (43), a second cylindrical bulge (49) is arranged on the adjusting cover (41), the adjusting spring (42) is clamped between the second cylindrical bulge (43) and the adjusting cover (41), and two ends of the adjusting spring (42) are respectively sleeved on the first cylindrical bulge (49); the inner seat (22) is provided with a first sealing ring (50) for forming sealing fit with the inner end of the inner cavity (28), the position of the inner seat (22) corresponding to the inner ring and the outer ring of the annular flow channel (45) is respectively provided with a second sealing ring (51) and a third sealing ring (52) for forming sealing fit with the outer seat (23), the detection rod (24) is provided with a fourth sealing ring (53) for forming sealing fit with the inner wall of the guide hole (30), the movable fan blade (33) is vertically provided with a first sealing strip (54) for forming sealing fit with the inner wall of the circular groove (37), and the fixed baffle (34) is vertically provided with a second sealing strip (55) for forming sealing fit with the peripheral side of the rotating shaft (32); when the flashboard (4) moves upwards and abuts against the inner end of the valve cover (3), the screw head of the connecting screw (11) is just attached to the lower end of the detecting rod (24).
2. A gate valve with a closing stop as defined in claim 1, wherein: the hydraulic stroke detection device (20) further comprises a guide pipe (56), an installation cavity (57) is arranged between the guide hole (30) and the overflow cavity (29), the diameter of the installation cavity (57) is smaller than that of the overflow cavity (29) and larger than that of the guide hole (30), the guide pipe (56) penetrates through the overflow cavity (29) and the installation cavity (57), two ends of the guide pipe (56) respectively abut against the lower end of the inner seat (22) and the lower end face of the installation cavity (57), the middle part of the lower end of the inner seat (22) is further connected with a set screw (58) in a threaded mode, the upper end of the guide pipe (56) is sleeved on the periphery of a screw head of the set screw (58), a plurality of through holes (59) which are communicated with the overflow cavity (29) are formed in the guide pipe (56), and the upper part of the detection rod (24) is arranged in the guide pipe (56) in a sliding mode.
3. A gate valve with a closing stop as claimed in claim 2, wherein: the upper portion of measuring rod (24) is equipped with a plurality of direction convex parts (60), pipe (56) inner wall be equipped with a plurality of along the axial extension and with direction concave part (61) of direction convex part (60) looks adaptation, the lower extreme threaded connection of measuring rod (24) has spacing screw (62), and the screw head external diameter of spacing screw (62) is greater than the diameter of measuring rod (24).
4. A gate valve with a closing stop as defined in claim 1, wherein: the rotary shaft is characterized in that a rotary hole (63) is formed in the middle of the circular groove (37), the lower end of the rotary shaft (32) is rotatably arranged in the rotary hole (63), a fifth sealing ring (64) used for forming sealing fit with the inner wall of the rotary hole (63) is arranged on the rotary shaft (32), a polygonal linkage part (66) is arranged at the upper end of the rotary shaft (32), a rotary disc (67) is arranged at the lower end of the linkage rod (35), a polygonal linkage hole (68) matched with the polygonal linkage part (66) is formed in the rotary disc (67), a shaft sleeve (69) is further arranged above the movable fan blade (33) and the fixed baffle (34), the rotary disc (67) is embedded in the shaft sleeve (69), and a sixth sealing ring (70) used for forming sealing fit with the shaft sleeve (69) is arranged on the rotary disc (67).
5. A gate valve with a closing stop as defined in claim 1, wherein: the upper end of gangbar (35) is equipped with center pin (71) and screw thread portion (72) in proper order, form location step (73) before center pin (71) and gangbar (35), centre bore (74) that supply center pin (71) to penetrate have been seted up to the one end of pointer (36), threaded connection has on screw thread portion (72) to be used for restricting the installation nut (75) on location step (73) with pointer (36) one end, outer end of outer seat (23) still install with pointer (36) matched with bearing (76).
6. A gate valve with a closing stop as defined in claim 1, wherein: the middle part of piston piece (43) has offered exhaust passage (77) along circumference, the upper end threaded connection of exhaust passage (77) has end cap (78) to press from both sides between end cap (78) and piston piece (43) and be equipped with sealing washer (79).
7. A gate valve with a closing stop as defined in claim 1, wherein: the regulating cover (41) is axially provided with a pressure stabilizing channel (80) for communicating the piston cavity (44) with the outside.
8. A gate valve with a closing stop as defined in claim 1, wherein: the hydraulic stroke detection device (20) further comprises a transparent dust cover (81), the transparent dust cover (81) is arranged above the base (21), a sleeving flange (82) extending along the circumferential direction is arranged at the lower end of the transparent dust cover (81), an annular sleeving groove (83) which is matched with the sleeving flange (82) is formed in the base (21), an annular locking groove (84) is formed in the annular sleeving groove (83), an annular locking rib (85) which is matched with the annular locking groove (84) is arranged on the sleeving flange (82), a standard line (86) is arranged on the inner side of the transparent dust cover (81), the pointer (36) is aligned with the standard line (86) in an initial state, and an air hole (87) is formed in the side of the transparent dust cover (81), and the air hole (87) is obliquely arranged from inside to outside.
9. A gate valve with a closing stop as defined in claim 1, wherein: the travel tube (18) periphery is equipped with first flange (88), be equipped with second flange (89) on base (21), first flange (88) are connected through a plurality of connecting bolt (90) with second flange (89), and the outer Zhou Jun cover of every connecting bolt (90) is equipped with a supporting spring (91), supporting spring (91) set up between first flange (88) and second flange (89) to offer on first flange (88) confession last spring groove (92) of the upper end embedding of supporting spring (91), offer on second flange (89) confession lower spring groove (93) of the lower extreme embedding of supporting spring (91).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061731.3A CN113757402B (en) | 2021-09-10 | 2021-09-10 | Gate valve with closing limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061731.3A CN113757402B (en) | 2021-09-10 | 2021-09-10 | Gate valve with closing limiting device |
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| Publication Number | Publication Date |
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| CN113757402A CN113757402A (en) | 2021-12-07 |
| CN113757402B true CN113757402B (en) | 2023-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111061731.3A Active CN113757402B (en) | 2021-09-10 | 2021-09-10 | Gate valve with closing limiting device |
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| Country | Link |
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| CN (1) | CN113757402B (en) |
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| CN212960137U (en) * | 2020-08-23 | 2021-04-13 | 北京市阀门总厂股份有限公司 | Rising stem plate valve closing limiting structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050156131A1 (en) * | 2004-01-16 | 2005-07-21 | Holliday David G. | Fire resistant valve assemblies |
| US10371284B2 (en) * | 2016-02-16 | 2019-08-06 | Baker Hughes, A Ge Company, Llc | Local position indicator for subsea isolation valve having no external position indication |
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|---|---|---|---|---|
| GB1591634A (en) * | 1977-09-21 | 1981-06-24 | Acf Ind Inc | Expanding gate valve and actuator |
| EP0174384A1 (en) * | 1984-09-12 | 1986-03-19 | Lavrids Knudsen Maskinfabrik A/S | Double seat valve |
| JPH09112713A (en) * | 1995-10-17 | 1997-05-02 | Hirata Valve Kogyo Kk | Gate valve |
| CN200955594Y (en) * | 2006-04-25 | 2007-10-03 | 中国石化工程建设公司 | Lifting valve |
| CN202349238U (en) * | 2011-12-19 | 2012-07-25 | 南通市力沛流体阀业有限公司 | Heavy-caliber buckle type gate valve with supercritical parameter |
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| CN112524274A (en) * | 2020-12-28 | 2021-03-19 | 大连大高阀门股份有限公司 | Channel gate valve |
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| Publication number | Publication date |
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| CN113757402A (en) | 2021-12-07 |
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